SB: Re: radiant floor pumps

["Tim Chamberlain" <spike@supersat2.net>]

----- Original Message -----
From: "Carolyn Hoagland" <choagland@connectec.com>
To: <strawbale@crest.org>
Sent: Saturday, November 23, 2002 6:07 AM
Subject: SB: radiant floor pumps


(snip)
>
> Have any of you had experience with this or other pumps (el sid,
> dankoff)?  Can you tell me some basic parameters of your system, how
> often your pumps run, what brand and size, are they on a timer or
> thermostat?  What water temp are you running on the supply side? (I
> assume the pumps can run less if your water is 130 degrees than if it is
> 90 degrees?) We can easily go DC or AC, depending on what type of pump
> has the best wire:water ratio.

On off grid systems use the March 809 or 809HS pump. They are a permanent
magnet pump that I have used with off grid systems. Also keeping your water
temp high will increase heat flow and decrease pump run time. I would stay
away from programable thermostats since the thermo mass of the house will
delay the programing cycles. If you felt that you might need it you could
always add it later.

Tim Chamberlain





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